Buller's
Shearwater, Puffinus bulleri

Buller's is the most beautiful of the shearwaters I have seen, with its
intricately patterned dorsal plumage, above and below, the dark feathers forming
an "M", and the pure white underparts framed by dark edges shown in the
ventral views further down the page.

Above, two Buller's on the water; below, one taking off.

Above, a Buller's (left) followed by a Pink-footed Shearwater; below, a single Buller's among 28 Pink-footed. Where's Waldo?